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RPU signs agreements for two 10 MW battery systems as part of resource plan
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Summary
Rochester Public Utilities presented and the council authorized two 10‑MW/4‑hour battery systems sited at RPU facilities under tolling agreements; staff said the projects (20 MW total) will capture capacity value and energy arbitrage and can be deployed quickly because they connect to the city’s distribution system.
Rochester Public Utilities asked the council Dec. 8 to authorize two 10‑MW/4‑hour battery systems (20 MW total) to be built at city‑controlled sites: the Zumbro Substation and the RPU service center. The council approved a resolution authorizing energy‑storage service agreements with LightShift Energy SPV LLC.
RPU staff explained the projects would be delivered under tolling agreements in which the developer builds, owns and maintains the battery systems while RPU is responsible for dispatch. Because the systems connect on the distribution side (behind the bulk‑grid meter), staff said they avoid long MISO interconnection queues and can be deployed rapidly. Each site would host a 10‑MW battery with four hours of duration; the agreements run roughly 15–20 years, during which the developer may replace degraded battery capacity.
Economics and operational use: RPU modeled the value as a combination of capacity market offsets and energy arbitrage. Staff noted the contract cost is "in the vicinity of $14 per kilowatt‑month" and presented a net modeled cost near $1.5 million after recognizing capacity and ancillary revenue; including modeled dispatch revenue (arbitrage) the project could approach breakeven under current market assumptions. Staff stressed the value of learning from an on‑system deployment and refining future procurement.
Safety and timing: Council members asked about fire department coordination and emergency response. RPU staff said modern battery designs compartmentalize cells to reduce propagation and described firefighting guidance (avoid direct water application on thermal‑runaway events; coordinate training with the fire department and developer). Staff also noted an investment‑tax‑credit timing risk (rules governing foreign‑sourced cells, called FIAC, tighten on Jan. 1, 2026), which is a reason to move promptly.
Vote and next steps: Councilmember Keane moved and council approved the energy‑storage agreements; staff indicated construction could begin after spring thaw 2026. RPU said it will track performance, share dispatch and revenue data with the council and evaluate future utility‑scale and distributed options.
Quote: "Because we are a member of Simpa and we get... full supply up to 216 megawatts from FEMPA, we need a special variance to participate in energy arbitrage," RPU staff said, explaining operational and market nuances.
What to watch: Staff will report on initial performance metrics, dispatch revenue and whether the FIAC/tariff environment shifts the economics of future battery procurements.
